Present Research Situation of Internal Morphology Controlling of Specimens Fabricated by Selective Laser Melting Based on Printing Parameters: a Review
YUAN Xinyi, LIU Yang, LI Mingxuan, LU Xiaofeng, ZHU Xiaolei*
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China
Abstract: In recent years, selective laser melting (SLM) technology has been used to solve issues surrounding the rapid manufacturing of complex structures and high-performance metal components. Due to this, it has become a very current and hot research topic for scholars. However, when SLM printing, a high temperature gradient and multi-scale, multi-factor, multi-form thermophysical coupling interaction occurs in the molten pool, and as a result, defects inevitably form inside the printed components. Thus, finding a way to fabricate components with high relative density and good comprehensive mechanical properties is one of the issues being researched currently. It is clear that the selection of printing parameters directly determines the printing quality of the component. Most of the printing parameter optimisation methods are based on experimental methods, but nowadays, as material is frequently changed, the corresponding experiments need to be repeated each time the type of material is changed. Currently, there is a lack of theory-based printing process control methods. The inside of the SLM component is stacked with a large number of molten pools, and the morphology and properties of these molten pools directly affect the final printing effect. For this reason, scholars have begun to focus their research on molten pools. Compared with the experimental method, the optimisation method, which has the molten pool as its research object, has a certain universality and greatly reduces the cost and time required for the experiment. However, this method still has obstacles to overcome, such as the difficulty in characterising the morphology of the molten pool, andthe unclear mechanism between printing parameters and this morphology. Thus, it still requires a lot of exploration. This article analyses domestic and foreign research papers related to the molten pool of selective laser melting, and introduces the internal defects and topography of the printing components, and the influence of printing parameters and their optimisation methods. This article also explains the importance of the molten pool and SLM printing parameters to control the internal morphology of those specimens fabricated by SLM. This paper sorts out the problems that still need to be further explored in this field. It can work as a reference and aid the further development and application of the selected laser melting technology.
袁信翊, 刘杨, 李明轩, 陆晓峰, 朱晓磊. 基于打印参数的选区激光熔化构件内部形貌调控研究现状[J]. 材料导报, 2022, 36(21): 20080263-9.
YUAN Xinyi, LIU Yang, LI Mingxuan, LU Xiaofeng, ZHU Xiaolei. Present Research Situation of Internal Morphology Controlling of Specimens Fabricated by Selective Laser Melting Based on Printing Parameters: a Review. Materials Reports, 2022, 36(21): 20080263-9.
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2022, Vol. 36 
